New field data combined with existing isotopic ages for the Western Province granites in peninsular Thailand allow a tentative kinematic history for the KMF and RF to be constructed:
•
The KMF and RF are zones of major strike-slip faulting divided into four phases:
D1 low grade ductile dextral strike-slip shear complete before 87 Ma.
D2 medium to high grade ductile dextral strike-slip shear after 72 Ma and before 56 Ma.
D3 brittle sinistral and sinistral reverse oblique strike-slip shear after 52 Ma.
D4 brittle dextral strike-slip shear at about 23 Ma.